1 files changed, 1 insertions, 0 deletions
diff --git a/config.mk b/config.mk
index 0cc3f5b..316594b 100644
--- a/config.mk
+++ b/config.mk
@@ -11,6 +11,7 @@ MAN1      = ${MANPREFIX}/man1
 
 # Flags
 CFLAGS  = -std=c99 -Wpedantic -Wall -Os
+CFLAGS += -D_XOPEN_SOURCE=700
 LDFLAGS = -s -static
 LIBS    = -lc